30岁女性，既往健康，晨起发病，四肢无力，进行性加重，2天后来诊。查：脑神经正常，四肢肌力O级，腱反射弱，病理反射阴性，无感觉障碍
应首先做的辅助检查是
A. 头部X线片
B. 头部CT
C. 牙部X线片
D. 脑电图
E. 以上都不是
硝酸甘油扩张血管的作用机制是
A. 直接扩张血管
B. 阻断α受体
C. 阻断钙通道
D. 促进K+外流
E. NO供体，通过释放NO发挥作用
A. Because physical examinations are given free there.B. Because he can get an influenza
A. Because physical examinations are given free there.
Because he can get an influenza vaccination there.
C. Because he'll be able to get a prescrpfion for medication there.
D. Because he'll find literature on nutrition there.
A. There aren't enough cabinets.B. There is too much noise.C. Office supplies are taking u
A. There aren't enough cabinets.
B. There is too much noise.
C. Office supplies are taking up space.
D. Some teaching assistants don't have desks.
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